Woodworking-clamp.



A. J. SCHU WOODWORKING APPLICATION IILED MAR.14, 1912.

1,029,471 Patented June 11,1912.

- 3 b .5 August a. scmue 365 W y W WW4 awe pump UNITED STATES AUGUST 3'.SGHULTE, OF TACOMA, WASHINGTON.

WOODWORKING-CLAIVIP.

Application filed March 14, 1912.

To all whom it may concern:

Be it known that I, AUGUsT J. SOHULTE, a citizen of the United States,residing at Tacoma, in the county of Pierce and State of ashington, haveinvented certain new and useful Improvements in VVoodworking- Clamps:and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to wood working, and more especially to portableclamps of that class having a pivoted lever; and the object of the sameits to produce a clamp of this kind more particularly adapted forclamping the stav'es in an article like a staved up wooden column. Thisobject is accomplished by constructing the clamp in the mannerhereinafter more fully described and claimed, and as shown in thedrawings wherein Figure 1 is a plan view of this clamp, showing it inthe act of clamping the staves of such a column. Fig. 2 is an enlargededge view of the clamp alone, and Fig. 3 an inside elevation thereof.Fig. 4 is an enlarged plan view of the clamp alone, showing the upperplate removed and the base plate out about on the sectional line 44 inFig. 2. Fig. 5 is a perspective detail of the dog. r

In the drawings Fig. 1 shows several staves or panels of the work whichthis tool is intended to hold, such as a staved up post or column whichis polygonal in cross. section and which is therefore difficult to clampin any kind of a vise because the beveled edges of the panels P must beforced into close contact so that the glue between them may set. Thisnecessitates the use of some kind of a clamp that will press all of thepanels radially inward toward a common axis with substantially equalforce, and hold them there, and it is desirable that the capacity of theclamp may be adjustable in order that it can be adapted to work ofdifferent sizes. 7

Coming now more particularly to the present invention, the numeral 1designates a base which is flat and straight, and from its edges projecttop and bottom plates 2 and 3 which stand at right angles to said baseand are slightly spaced as best seen in Fig. 2 and have rims or flanges4 around their peripheries projecting toward each Specification ofLetters Patent.

PatentedJune11, 1912.

Serial No. 683,833.

other and struck on an are around a common center 5 which forms the mainpivot for a lever 6 having a handle 7. The pivot is by preference arivet as best seen in Fig. 2, and it passes through a boss 8 at theinner end of the lever, a washer 9 filling out the dis tance between theinner faces of the plates as shown. From said boss the lever 6 projectsat right angles to the axis of the pivot 5, and it is of such thicknessthat it may swing between the inner edges of the two rims 4 and stand incontact with one but be disposed a little distance remote from the otheras also best seen in Fig. 2.

Pivoted at 10 to one end of the base is a claw 11 having a hook 12 atits outer end, and secured to or formed integral with the lever isanother hook 13. Engaged with said hooks is a chain 14 adapted to passaround the work P as shown in Fig. 1, one extremity of the chain beingby preference engaged with one hook, and the other hook being removablyengaged with such link of the chain as is necessary on account of thesize of the work. It follows that when the lever is moved in thedirection of the arrow shown in Fig. 1, the chain will be drawn tightaround the work and the latter will be clamped. The base 1 then restsflat against the outer face of one panel 'P, and the claw 11 flatagainst the outer face of another with the pivot 10 standing over theangle between such faces, and by preference both the base and the claware of such length that they will not project entirely across thenarrowest panel which this clamp is intended to in close.

Pivoted at 20 to the side of the lever 6 is a dog 21 having cut throughits outer face a transverse notch 22 whose depth is such that it willengage the rim 4 while the remote face of the lever 6 rests against theopposite rim 4 as seen in Fig. 2; and the lever carries a stop 23against which this dog rests as seen in Fig. 4 when its notch stands insuch position with respect to the main pivot 5 that it will not bite therim 4 as the lever is swung to and fro.

The operation of this improved clamp will now be understood. Placing thebase' 1 against one panel and the claw 11 over another, the operatorleads the chain 14 around the piece of work and engages the proper linkwith the hook 12, and then.

grasping the handle 7 he moves the lever 6 in the direction of the arrowshown in Fig. 1 so that the dog (now resting against the stop 23 as seenin Fig. 4:) slides over the rim 4. WVhen the desired tension has beenimparted to the chain, the operator moves the handle 7 backward slightlyso that the dog 21 is canted on its pivot 20 and its notch 22 bites therim as shown in Fig. 1, and further movement of the lever 6 to the leftin that view is prevented. The work is now permitted to rest until theglue dries. T 0 release the clamp, the operator has but to again strainthe lever to the right in the direction of the arrow, and, holding thedog 21 against the stop 23, move the lever and dog to the left until thetension is taken off the chain, after which the entire clamp can beremoved from the work in a manner which will be clear. Thus it will beseen that I have produced a portable work-holding clamp composedof butfew parts, simple in its operation, easy of manufacture and use, and yetwhich will reliably clamp and hold together the staves of a piece ofwork of the character described, providing its size is not beyond thelimit of the capacity of the clamp which is governed only by the lengthof the chain. I consider the use of.

a biting dog which will engage the rim at any fraction of an inch betterthan the use of a pawl and toothed segment because the latter has onlyas many points of engagement as there are teeth and ifthe teeth are madefine to amplify the points of engagement they are easily worn or the tipof the pawl is likely to slip off of them.

The parts of this improved device may be of any desired materials andproportions, and changes in the exact details shown may be made atwill.'

What is claimed as new is:

1. In a work-holding clamp, the combination with a flat base, a clawpivoted at one end to one end of the base and having a hook at its otherend, and a chain; of parallel plates projecting at right angles from theedges of the base and having arcuate rims around their peripheriesdirected inward toward but spaced from each other, a main pivot throughsaid plates at the center of the circle around which said rims arestruck, a lever having a boss at its inner end journaled on said pivotand resting against the inner face of one of said plates when one sideof the lever rests against the edge of the rim of said plate, a washeron the pivot between the inner face of the opposite plate and the otherendof the boss, a dog movably connected with the lever and adapted toengage the rim of the last-named plate, and a hook on the lever adaptedto engage said chain.

2. In a work-holding clamp, the combination with a flat base havingparallel plates projecting from its edges and provided around theirperipheries with arcuate rims projecting inward toward but spaced fromeach other, a hook connected with one end of said base, and a main pivotthrough said plates near the base at the center of the circle aroundwhich said rims are struck; of a lever mounted on said pivot andprojecting between said rims and having a handle at its outer end, ahook on the lever beyond said rims, a stop on the lever adjacent saidhook, a dog pivoted to the lever and projecting inward between said rimsand having in its outer face a trans verse notch struck on a line toslide over one of said rims when the dog rests against the stop, and achain connecting said hooks.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

AUGUST J. soHULTn WVitnesses:

ADoLrH H. Fisor-mn, CHARLES ARNT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

. Washington, D. C.

